/*
This file is part of LilyPond, the GNU music typesetter.
- Copyright (C) 2004--2011 Han-Wen Nienhuys <hanwen@xs4all.nl>
+ Copyright (C) 2004--2014 Han-Wen Nienhuys <hanwen@xs4all.nl>
LilyPond is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
#include "self-alignment-interface.hh"
#include "grob.hh"
+#include "note-column.hh"
#include "paper-column.hh"
+#include "pointer-group-interface.hh"
#include "warn.hh"
MAKE_SCHEME_CALLBACK (Self_alignment_interface, y_aligned_on_self, 1);
Self_alignment_interface::aligned_on_self (Grob *me, Axis a, bool pure, int start, int end)
{
SCM sym = (a == X_AXIS) ? ly_symbol2scm ("self-alignment-X")
- : ly_symbol2scm ("self-alignment-Y");
+ : ly_symbol2scm ("self-alignment-Y");
SCM align (me->internal_get_property (sym));
if (scm_is_number (align))
{
Interval ext (me->maybe_pure_extent (me, a, pure, start, end));
- if (ext.is_empty ())
- programming_error ("cannot align on self: empty element");
- else
- return scm_from_double (- ext.linear_combination (scm_to_double (align)));
+ // Empty extent doesn't mean an error - we simply don't align such grobs.
+ // However, empty extent and non-empty stencil would be suspicious.
+ if (!ext.is_empty ())
+ return scm_from_double (- ext.linear_combination (scm_to_double (align)));
+ else if (me->get_stencil ())
+ warning (me->name () + " has empty extent and non-empty stencil.");
}
return scm_from_double (0.0);
}
-
SCM
Self_alignment_interface::centered_on_object (Grob *him, Axis a)
{
return centered_on_object (unsmob_grob (smob)->get_parent (X_AXIS), X_AXIS);
}
+MAKE_SCHEME_CALLBACK (Self_alignment_interface, centered_on_note_columns, 1);
+SCM
+Self_alignment_interface::centered_on_note_columns (SCM smob)
+{
+ Item *it = unsmob_item (smob)->get_column ();
+ if (!it)
+ return scm_from_double (0.0);
+
+ extract_grob_set (it, "elements", elts);
+ vector<Grob *> ncs;
+ Interval centers;
+ for (vsize i = 0; i < elts.size (); i++)
+ if (Note_column::has_interface (elts[i]))
+ centers.add_point (scm_to_double (centered_on_object (elts[i], X_AXIS)));
+
+ if (centers.is_empty ())
+ return scm_from_double (0.0);
+
+ return scm_from_double (centers.center ());
+}
+
MAKE_SCHEME_CALLBACK (Self_alignment_interface, centered_on_y_parent, 1);
SCM
Self_alignment_interface::centered_on_y_parent (SCM smob)
return centered_on_object (unsmob_grob (smob)->get_parent (Y_AXIS), X_AXIS);
}
-MAKE_SCHEME_CALLBACK (Self_alignment_interface, aligned_on_x_parent,1);
+MAKE_SCHEME_CALLBACK (Self_alignment_interface, aligned_on_x_parent, 1);
SCM
Self_alignment_interface::aligned_on_x_parent (SCM smob)
{
return aligned_on_parent (unsmob_grob (smob), X_AXIS);
}
-MAKE_SCHEME_CALLBACK (Self_alignment_interface, aligned_on_y_parent,1);
+MAKE_SCHEME_CALLBACK (Self_alignment_interface, aligned_on_y_parent, 1);
SCM
Self_alignment_interface::aligned_on_y_parent (SCM smob)
{
Interval he = him->extent (him, a);
SCM sym = (a == X_AXIS) ? ly_symbol2scm ("self-alignment-X")
- : ly_symbol2scm ("self-alignment-Y");
+ : ly_symbol2scm ("self-alignment-Y");
SCM align_prop (me->internal_get_property (sym));
if (!scm_is_number (align_prop))
Real align = scm_to_double (align_prop);
Interval ext (me->extent (me, a));
- if (ext.is_empty ())
- programming_error ("cannot align on self: empty element");
- else
+
+ // Empty extent doesn't mean an error - we simply don't align such grobs.
+ // However, empty extent and non-empty stencil would be suspicious.
+ if (!ext.is_empty ())
x -= ext.linear_combination (align);
+ else if (me->get_stencil ())
+ warning (me->name () + " has empty extent and non-empty stencil.");
+ // See comment above.
if (!he.is_empty ())
x += he.linear_combination (align);
+ else if (him->get_stencil ())
+ warning (him->name () + " has empty extent and non-empty stencil.");
return scm_from_double (x);
}
Self_alignment_interface::set_center_parent (Grob *me, Axis a)
{
add_offset_callback (me,
- (a == X_AXIS) ? centered_on_x_parent_proc : centered_on_y_parent_proc,
- a);
+ (a == X_AXIS) ? centered_on_x_parent_proc : centered_on_y_parent_proc,
+ a);
}
void
Self_alignment_interface::set_align_self (Grob *me, Axis a)
{
add_offset_callback (me,
- (a == X_AXIS) ? x_aligned_on_self_proc : y_aligned_on_self_proc,
- a);
+ (a == X_AXIS) ? x_aligned_on_self_proc : y_aligned_on_self_proc,
+ a);
}
ADD_INTERFACE (Self_alignment_interface,
- "Position this object on itself and/or on its parent. To this"
- " end, the following functions are provided:\n"
- "\n"
- "@table @code\n"
- "@item Self_alignment_interface::[xy]_aligned_on_self\n"
- "Align self on reference point, using"
- " @code{self-alignment-X} and @code{self-alignment-Y}."
- "@item Self_alignment_interface::aligned_on_[xy]_parent\n"
- "@item Self_alignment_interface::centered_on_[xy]_parent\n"
- "Shift the object so its own reference point is centered on"
- " the extent of the parent\n"
- "@end table\n",
-
- /* properties */
- "self-alignment-X "
- "self-alignment-Y "
- );
+ "Position this object on itself and/or on its parent. To this"
+ " end, the following functions are provided:\n"
+ "\n"
+ "@table @code\n"
+ "@item Self_alignment_interface::[xy]_aligned_on_self\n"
+ "Align self on reference point, using"
+ " @code{self-alignment-X} and @code{self-alignment-Y}."
+ "@item Self_alignment_interface::aligned_on_[xy]_parent\n"
+ "@item Self_alignment_interface::centered_on_[xy]_parent\n"
+ "Shift the object so its own reference point is centered on"
+ " the extent of the parent\n"
+ "@end table\n",
+
+ /* properties */
+ "self-alignment-X "
+ "self-alignment-Y "
+ );
projects / lilypond.git / blobdiff